Captain Tom Armitage

Clive Brook

Acting

Lieutenant Cranford

John Clements

Acting

Captain Eckersley

Edward Chapman

Acting

Lucy Armitage

Judy Campbell

Acting

Mabel

Penelope Dudley-Ward

Acting

Mr. Matthews

Edward Rigby

Acting

Commander Blount

Allan Jeayes

Acting

Dot

Michael Wilding

Acting

Lt. Commander Martin

Harold Warrender

Acting

Captain Sandeman

David Hutcheson

Acting

Bates

George Carney

Acting

Knowles

Al Millen

Acting

Walker

Charles Farrell

Acting

Gates

John Laurie

Acting

Parker

George Benson

Acting

Minesweeper Skipper

Hay Petrie

Acting

His Mate

Mervyn Johns

Acting

Commander U.37

Albert Lieven

Acting

Commander Deutschland

John Wengraf

Acting

Merchantman Skipper

Edward Lexy

Acting

Mate

John Glyn-Jones

Acting

German Captain

John Boxer

Acting

Edmonds

John Carol

Acting

Bit Part

Alec Clunes

Acting

U-Boat Officer

Anton Diffring

Acting

Hawkins

Derek Elphinstone

Acting

Bosun's Mate

Alf Goddard

Acting

Sutton

Stewart Granger

Acting

Signals Yeoman

Bryan Herbert

Acting

Holt

Patrick Holt

Acting

Admiral

James Knight

Acting

Mary Hogan

Maire O'Neill

Acting

Peacock - Wardroom Steward

Charles Rolfe

Acting

Sailor

Harry Terry

Acting

'Shorty' Howard

Charles Williams

Acting

Gunnery Officer (uncredited)

Howard Lang

Acting